JACK™ HPA Conversion Kit
JACK™ HPA Conversion Kit

JACK™ HPA Conversion Kit

Regular price $349 now $342

Code Name "Simple Jack"

The JACK™ was designed to answer the demand for an affordable, high performance HPA (High Pressure Air) conversion for AEG's. The system is a drop-in cylinder replacement that is universally compatible with a wide range of gearbox versions that have center-line nozzles. PolarStar Filter Fitting now included!

Similar to its sister products, the JACK™ replaces the original gearbox components with a programmable pneumatic system allowing for higher performance and greater reliability over a gear driven system. Although economically priced, the JACK™ still retains the same performance and quality you have come to expect from PolarStar products.

The JACK™ has only one moving part, the nozzle, which acts as its own poppet valve. Similar to the Fusion Engine™ and F2™ poppet, the nozzle is only piloted by the solenoid to open air flow through the poppet with none of the firing air coming from the solenoid itself. This design lets the JACK™ send a higher flow of air down the barrel than systems that only use a solenoid as the firing valve.

Gel Blaster JACK

Gel Ball Compatible

JACK HPA conversion kits can also be configured for use in gel ball systems.

Please contact us for information on ordering JACK systems for gel ball use.

 

Velocity: 500fps w/ .20g @ 130psi
The JACK™ allows for easy velocity adjustment by changing input pressure and does not require different nozzles to reach its full velocity range. Using a standard M4 as an example, velocity can be adjusted from below 280fps and up to approximately 500fps with a .20g BB. Velocity can vary per model as longer barrels will increase the maximum velocity while shorter barrels will decrease it. 
ROF: 30rps
The maximum cyclic rate of the JACK™ is affected by several factors such as the operating pressure as well as quality of the magazine and BB's used. However, 30 rounds per second is achievable in most standard configurations.
Air Efficiency: 1000+ shots from 13/3000 @ 1.5J  w/ .28g
Although not a critical requirement during development, JACK™ does boast some highly respectable figures in this category. This is made possible by its intelligently laid out design which minimizes dead volume resulting in better air flow, faster response and less air used per shot.
(Test Configuration: 6.05x375mm Barrel)

     

    **All kits come with a Filter Fitting installed, FCU, Switchboard, Wire Harness and any additional components needed to convert the specific airsoft rifle model for which the kit is configured. The HPA Tank, Air Rig (regulator and line) and Battery needed to operate the system are purchased separately.**

     

    Customer Reviews

    Based on 246 reviews
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    J
    Jackson
    Polarstar JACK Question

    Hello, I am looking into building an HPA rifle with this engine. My plan is to buy some sort of M4 frame and put the JACK engine into it. I also just wanted to know what all came with buying this product and what else I would need to buy to complete the build.

    Thank you very much for the help, Jackson

    R
    Redmrulzz
    I have a question because I'm looking to buy one at 12 years old.

    I was wondering if it came with all the parts. (FCU, trigger board and and of the air lines). i really want a JACK but don't know if it is friendly for younger kids like me to put in a gun. if you have answers, please leave them in the review segment! thank you!

    Hey! Great question — we’re pumped you're looking into the JACK!

    All JACK kits come with a Filter Fitting installed, FCU, Switchboard, Wire Harness, and any additional components needed to convert the specific airsoft rifle model for which the kit is configured. The HPA tank, air rig (regulator and line), and battery needed to operate the system are purchased separately, since players usually customize those to their personal setup.

    As for installation — the JACK is actually one of the most beginner-friendly HPA engines out there. If you're comfortable working with tools and following instructions, it's very doable, even for younger players. And don’t worry — we’ve got install guides and videos to walk you through the whole process. If you ever need help, our support team’s always got your back.

    Appreciate the question — you're already on the right track!

    – PolarStar Team

    L
    L.C.

    Very good product perfect for your first HPA engine. Shoots like butter right out of the box.

    Z
    Zachary Burghardt
    Game Changer

    The PolarStar Jack is a remarkable piece of engineering that significantly enhances airsoft performance. Its compact design makes it easy to install in various platforms, and the integrated HPA system provides consistent power and accuracy. I love the intuitive tuning options, which allow for quick adjustments to suit any gameplay style. The build quality is top-notch, ensuring durability in demanding conditions. Overall, the Jack is a game-changer for serious players looking for reliability and precision on the field. Highly recommended!

    S
    Storbacka Axel
    Quiet and Fast

    Works great for a quiet and fast Cqb weapon